CN102992575A - Steam thermal cycle sludge drying method and system - Google Patents
Steam thermal cycle sludge drying method and system Download PDFInfo
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- CN102992575A CN102992575A CN2012105410060A CN201210541006A CN102992575A CN 102992575 A CN102992575 A CN 102992575A CN 2012105410060 A CN2012105410060 A CN 2012105410060A CN 201210541006 A CN201210541006 A CN 201210541006A CN 102992575 A CN102992575 A CN 102992575A
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Abstract
The invention relates to a steam thermal cycle sludge drying method and system, wherein the method comprises the following steps of: (1) preheating sludge; (2) exchanging heat and drying the sludge from the step (1) by adopting steam as a heat source gas; (3) cooling and discharging the sludge from the step (2). The system comprises a preheating feeding device, a drying device, a technology cycle gas recycling device and a cooling and discharging device; the drying device comprises an evaporation chamber and a drying chamber which are sequentially connected; a sludge outlet of the preheating feeding device is connected with a sludge inlet of the drying device; a recycling steam outlet of the drying device is connected with a steam inlet of the technology cycle gas recycling device through a pipeline; the drying device is provided with a heat source gas inlet; and the heat source gas inlet of the drying device is connected with a steam outlet of the technology cycle gas recycling device through a heat source pipeline. According to the invention, energy source recycling measures are adopted, and the steam thermal cycle sludge drying method and system has the advantages of high evaporation efficiency, low cost, low energy consumption and the like.
Description
Technical field
The present invention relates to the method for sludge drying and adopt the employed system of this method, belong to technical field of sludge treatment.
Background technology
Along with country in recent years continues to increase the environment protection dynamics, water environment treatment obtains important achievement, and water treatment rate and compliance rate constantly promote.But all kinds of mud that water treatment procedure produces have formed new environmental problem.
Mud is the solid precipitation material that produces in the sewage treatment process, comprises in addition the comparatively approaching sedimentable matter of physical properties that produces in the Industrial processes, and the mud of sludge treatment indication mainly is the biochemical sludge that sewage treatment process produces.At present sewage disposal department common configuration mechanical dehydration device, water ratio is still up to 80-85% after the biochemical sludge dehydration.These mud are because bulky, easily corrupt, stacking and storing has larger environmental risk, and in November, 2010, Chinese Ministry of Environmental Protection sent " about strengthening the notice of urban wastewater treatment firm mud prevention and cure of pollution work ", and sludge disposal becomes the problem of pendulum before each sewage disposal unit plane.
Sludge drying is an important technology in the Sludge Disposal Techniques route.The difficult problem of sludge disposal is water cut, and the dehydrated sludge water ratio is reduced to 30% from 80%, and total amount reduces 71%, and sludge drying is the most direct method of mud decrement, and the product behind the sludge drying has also been created condition for carbonization, the utilization of resources.
Carry out Sludge Disposal Techniques research abroad early, Sludge Disposal Techniques has had nearly 40 years exploration and practice in Japan and American-European countries, all kinds of sludge disposal technologies of present domestic appearance, and major part comes from abroad.
Sludge drying technique is one of gordian technique for the treatment of sludge as the important method of mud decrement, but the general cost of investment of the mud drying device that enters Chinese market is high, and existing mud drying device generally adopts the technology of similar Chemical Industry Drying equipment, do not carry out the technology setting that reduces energy consumption, running cost and energy consumption have exceeded sustainability of enterprises, and too high energy consumption does not meet the requirement of China's energy-saving and emission-reduction yet.These characteristics have largely limited the application of sludge drying technique.
In the face of the demand in domestic sludge treatment market, the exploitation less energy-consumption, domestic sludge drying system is very urgent cheaply.The main flow drying sludge technology representative of existing domestic market has belt drying (amber, SAVAR), fluidised bed drying (An Deli thatch), two-part dry (it is full to get profit), thin layer formula dry (VOMM, BUSS), Paddle Drying (ball is red, chats, Yue Dao), disc type dry (Mitsubishi, Some Domestic producer).In the operational path that these producers provide at present, do not consider the energy recovery measure, overall hear rate is higher, and working cost is high.The mud that will wet evaporates 1 kg of water, needs to consume 650-900 kilocalorie heat, 0.03-0.2 degree electricity, and the 10-30kg water of condensation is pressed energy equivalent conversion comprehensive energy consumption 2.8-4.6MJ/kg vaporize water.
Wherein adopt circulation technology gas except the thin layer formula is dry, the water vapour that evaporates is circulated, process gas is through dedusting, intensification, and it is wet for carrying that major part is got back to moisture eliminator, and process gas is told bypass and carried out the dehumidification by condensation operation.Because major part is water vapor in the recycle gas, exhausted air quantity and the needed water of condensation of condensation operation that whole system produces are less.The water vapour that the drying sludge process produces is not utilized.
Other dry technology does not adopt circulation technology gas, directly suction air enters moisture eliminator, take away the moisture of mud, the steam that drying process produces and the air of suction discharge after by condensation cleaning, the gas that the air mixed mud that this class technology is introduced gives out, after producing a large amount of circulating cooling water condensation cooling of a large amount of foul smell consumption, deodorizing is processed.The water vapour that the drying sludge process produces is not utilized.
Summary of the invention
For overcoming the defects of prior art, the purpose of this invention is to provide a kind of sludge drying method and system that considers energy recovery, low cost, less energy-consumption.
Technical scheme of the present invention is: the method for a kind of steam heat circulating sludge mummification may further comprise the steps:
(1) mud is carried out preheating;
(2) adopting steam is thermal source gas, and the mud of step (1) is carried out heat exchange and drying;
(3) to the mud of step (2) cool off, discharge.
Step (1) can be airtight and can discharge under the environment of a small amount of non-condensable gas and carry out, and the steam condensate that can adopt described step (2) to produce carries out preheating to mud, the whole of the heat exchange lime set that produces after heat exchange can be heat-eliminating medium or a part of heat-eliminating medium as step (3) of step (3), and redundance is discharged as waste water.
Described heat exchange lime set can be used for step (1) as the heat release medium of preheating mud.
Steam described in the step (2) can also add or not add supplemental heat source as required for technological cycle gas, described supplemental heat source is preferably live steam, the technological cycle gas that step (2) produces distributes after dedusting, filtration and mechanically compress, obtain the technological cycle gas that pressure raises, has relevant pressure and temperature after mechanically compress, can be reused for heat exchange and the drying process of step (2).
In the step (2), described heat exchange and drying can be carried out under negative pressure and air tight condition in two steps successively, described heat exchange can be adopted the indirect heat exchange mode, described mud and steam are isolated mutually and the heat-transfer surface by between the two carries out heat exchange, heat energy conducts to mud by steam and the water in the mud is evaporated, described drying can be for directly contacting and make wherein moisture evaporation with the mud after superheated vapour and the heat exchange, superheated vapour after the steam of the formation of described mud in dry evaporative process is sneaked into heat release consists of the part of described technological cycle gas.
A kind of steam heat circulating sludge anhydration system, comprise preheating feeding device, desiccation apparatus, technological cycle gas reclamation set and cooling discharge device, described desiccation apparatus comprises successively directly mud being carried out drying and take away the kiln of the water vapor that mud evaporates take indirect heat exchange as main evaporator room with superheated vapour of connecting, the sludge outlet of described preheating feeding device connects the mud import of described desiccation apparatus, the recovered steam outlet of described desiccation apparatus is connected by the steam inlet of pipeline with described technological cycle gas reclamation set, described desiccation apparatus is provided with the thermal source gas feed, and the thermal source gas feed of described desiccation apparatus connects the vapour outlet of described technological cycle gas reclamation set by the thermal source pipeline.
Described system can also be provided with and replenish the steam-pipe that steam uses and the vacuum gooster pump that is used for forming the certain vacuum degree in described desiccation apparatus, described steam-pipe can replenish valve access thermal source pipeline or directly access described desiccation apparatus by the additional valve of steam by steam, can be provided with agitator and scraper plate in the described desiccation apparatus, the heat-exchanger rig that carries out indirect heat exchange for mud and steam can be provided with in the described evaporator room, the drying chamber that allows steam and mud directly to contact can be provided with in the described kiln.
Described technological cycle gas reclamation set can be by the dust removing units that connects successively, filtering unit, mechanically compress unit and allocation units form, the recovered steam outlet of described desiccation apparatus can connect by pipeline the steam inlet of dust removing units, the vapour outlet of described allocation units can or connect respectively kiln and the evaporator room of described desiccation apparatus by a pipeline by different pipelines, described allocation units can be provided with for the control device that distributes evaporator room and kiln thermal source gas ratio, and described mechanically compress unit preferably adopts centrifugal, device after one or more devices in series in Roots type or the positive displacement vapour compression equipment.
The lime set outlet of described desiccation apparatus can be connected with the lime set import of described preheating feeding device by pipeline, the sludge outlet of described desiccation apparatus can be connected with the mud import of described cooling discharge device by pipeline, described preheating feeding device is preferably total closed type, can be provided with heat-exchanger rig and gas barrier.
The sludge outlet of described cooling discharge device can connect the sludge-drying discharge line, and the sludge inlet of described preheating feeding device can be provided with the sewage sludge feed pipeline.
Beneficial effect of the present invention is: before mud carries out drying mud is carried out preheating, reduce in the drying process because of the low generation of mud temperature surface condensation or fixed, be conducive to improve the physical property of mud in drying process, convenient working, raising is to the utilising efficiency of thermal source and the vaporization efficiency of mud, improve the degree of drying of outlet mud, reduce water content; The steam that produces in the drying sludge process and contained heat energy (comprise the contained original heat energy of thermal source gas, mud can input etc. the heat energy that produces because of the biochemical reaction of inside continuity and exterior mechanical in treating processes) are back to drying process after treatment again, substitute a large amount of fresh heat that evaporation consumes, and the water resources that heat transfer process produces is fully used, thereby energy efficient and material consumption reduce cost; The preheating of mud and drying process are all finished under airtight environment, make the stopping property of whole system strong, only have a small amount of non-condensable gas to discharge, and reduce the processing pressure of foul smell; Need carry out dedusting, filtration treatment before the reuse of technological cycle gas, this processing process avoids dust to carry secretly entering that air-channel system sets off an explosion, the fouling equivalent risk; The heat transfer process of mud is take indirect heat exchange as main, realize the pressure decatizing steam raising environment of mud, improve vaporization efficiency, in the drying process of mud, make the steam the inside after steam after mud and the surface-moisture evaporation that is beneficial to mud after steam fully contacts after the heat exchange is sneaked into heat release, thereby be convenient to realize heat recuperation.Because adopting process circulation gas reclamation set, has substituted a large amount of fresh heat that evaporation consumes so that the steam calorific value of the technological cycle gas that desiccation apparatus is discharged is back to desiccation apparatus again, has saved energy consumption, comprehensive energy consumption is saved 65-82% compared to existing technology; Owing to adopt preheating feeding device before drying, wet mud to be carried out thermal pretreatment, when carrying out drying in desiccation apparatus, minimizing steam hangs down the generation surface condensation because of the mud temperature, reduce or avoided condensing in a large number to the interference of technological process because of steam, improved the vaporization efficiency of desiccation apparatus mud ingress, used heat is recycled, improve the overall thermal efficient of desiccation apparatus; Owing to adopt the desiccation apparatus with high evaporation efficient, so that the time shorten that mud stops in installing reduces frequent, the low vaporization efficiency that reaches the unsettled impact of heat recuperation and improved sludge water content of heat recovery efficiency of overhaul of the equipments that the mud bonding causes; Because whole system adopts totally-enclosed operation, the gas barrier that a small amount of non-condensable gas is provided with because of preheating feeding device inside can be used for the gas-tight silo sealing gland, without the foul smell discharging, reduces the foul smell blowdown presssure; Because desiccation apparatus is comprised of evaporator room and kiln, drying process is divided into evaporation and dry two processing steps that carry out continuously, and carry out the evaporation of mud by the mode of steam indirect heating, carry out drying by the mode that steam and mud directly contact, realized the pressure decatizing steam raising environment of mud, improved vaporization efficiency, in kiln, realize the drying process of mud, make the steam the inside after steam after mud and the surface-moisture evaporation that is beneficial to mud after steam fully contacts after the heat exchange is sneaked into heat release, thereby be convenient to realize heat recuperation, particularly this mode takes full advantage of the variation of mud physical property in continuing drying process, can according to different mud wait by experiment mode optimize the evaporation and drying process in device parameter and processing parameter, to reduce or to avoid fixed and the fouling on heat-transfer surface of mud in drying process, be very easy to operation, and be conducive to the maintenance cycle of extension device, reduce maintenance cost and also increase work efficiency.Experiment according to the applicant, this mode that is divided into above-mentioned two step mummification on the preheating basis with respect to existing common technology, can reduce steam thermal energy consumption and mechanical power consumption significantly, shorten the treatment time, and can improve significantly the mummification degree of outlet mud.
Description of drawings
Fig. 1 is structural representation of the present invention.
Embodiment
The invention provides the method for a kind of steam heat circulating sludge mummification, may further comprise the steps:
(1) before mud carries out drying, airtight and can discharge under the environment of a small amount of non-condensable gas, adopt the steam condensate mud that will wet to be preheating to 50-80 degree centigrade, but thus reduce mud in drying process because of the condensing of the surperficial steam of the too low generation of Sludge Surface temperature, thereby improve the vaporization efficiency of mud.Temperature through producing after the heat exchange is reduced to room temperature than the high heat exchange lime set of room temperature water temperature after regulating purifying treatment, and the heat exchange lime set of reducing to room temperature all remains a part of heat exchange lime set as the heat-absorbing medium of sludge-drying or a part as the heat-absorbing medium of mud cooling and discharges as waste water after the oil content in removing water.
(2) mud after the preheating is carried out drying treatment, the thermal source gas that adopts is mainly superheated vapo(u)r established technology recycle gas, a small amount of supplemental heat source or need not supplemental heat source according to actual needs, described supplemental heat source is live steam, and adopting the supplemental heat source purpose is to keep system temperature, assurance steam output.Under airtight and subnormal ambient, mud after the preheating at first carries out heat exchange at heat-transfer surface and technological cycle gas, the indirect heat exchange mode is adopted in heat exchange, mud and steam are isolated mutually and the heat-transfer surface by between the two carries out heat exchange, make heat energy conduct to mud by steam and make water evaporation in the mud, next step carries out drying treatment mud after the heat exchange, drying is directly to contact and make wherein moisture evaporation with the mud after superheated vapour and the heat exchange, superheated vapour after the steam that mud forms in dry evaporative process is sneaked into heat release consists of the part of described technological cycle gas.To make the residing environment of drying process be condition of negative pressure by regulating inner pressure, when negative pressure be-during 0.02MPa, mud can be finished drying under 60-80 degree centigrade.Sludge Surface water behind the absorbing heat is vaporized rapidly, mud is constantly updated the surface through stirring, mud is fully contacted with technological cycle gas, thereby raising vaporization efficiency, the steam that evaporation forms is sneaked into the superheated vapour after the heat release, the lime set that produces in the drying process is reused for the pre-heating stage of mud, technological cycle gas after heat exchange is avoided dust to carry secretly through dedusting and is caused blast, after the risk of fouling and filtration improve the cleanliness factor of technological cycle gas, again technological cycle gas is heated up, mechanically compress, high pressure and temperature before the technological cycle gas by mechanically compress has.Divide according to monitor signal at last to be used in drying process heat exchange and dry gas ratio, again be back to heat exchange and the drying process of mud, thereby reach the abundant reuse of recycle gas, reduce energy consumption, comprehensive energy consumption is saved 65-82% compared to existing technology.
(3) after drying higher need of mud Yin Wendu cool off discharge and process, the cooling gas that adopts in the process of cooling is that temperature that the mud warm produces, that obtain after the adjusting purifying treatment is the lime set of room temperature, the sludge-drying that the higher mud of temperature is carried out obtaining after heat exchange is processed discharges, and the lime set that the temperature after heat exchange is higher is back to the warm of mud as the heat release medium of preheating mud.
As shown in Figure 1, the present invention also provides the system of a kind of steam heat circulating sludge mummification, and this system is used for implementing the method for above-mentioned steam heat circulating sludge mummification and the method work of the above-mentioned steam heat circulating sludge of foundation mummification.Comprise preheating feeding device 1, technological cycle gas reclamation set, desiccation apparatus 2 and cooling discharge device 3, desiccation apparatus 2 comprises directly mud being carried out drying take indirect heat exchange as main evaporator room with take superheated vapour as thermal source and taking away the kiln of the water vapor that mud evaporates of connecting successively.The sludge outlet of preheating feeding device 1 connects the mud import of desiccation apparatus 2, the lime set outlet of cooling discharge device 3 connects the lime set import of preheating feeding device 1, the recovered steam outlet of desiccation apparatus 2 is connected by the steam inlet of pipeline with technological cycle gas reclamation set, desiccation apparatus is provided with the thermal source gas feed, and its thermal source gas feed connects the vapour outlet of technological cycle gas reclamation set by the thermal source pipeline.
The sludge inlet of preheating feeding device 1 is provided with the pipeline for wet sewage sludge feed, this pipeline is the custody transfer space, wet mud thus pipeline enters in the preheating feeding device, the steam condensate mud that will wet at the heat-transfer surface place of the heat-exchanger rig of preheating feeding device inside is preheating to 50-80 degree centigrade, after reducing to room temperature, heat exchange lime set through producing after the heat exchange all by the wastewater discharge pipe road lime set is discharged as waste water after the lime set temperature is reduced to room temperature as heat release medium or the part of the complete later on mud of cooling drying, another part is reduced to room temperature through the lime set temperature, it is inner to enter the cooling discharge device after the supercharging circulation, carry out heat exchange by the heat-exchanger rig that is positioned at cooling discharge device inside with the comparatively high temps mud of processing and obtain the lower sludge-drying of temperature, sludge-drying is discharged by the sludge-drying discharge line that connects the cooling discharge device, the heat exchange lime set that is loaded with heat is entered by the lime set outlet of cooling discharge device that the heat release medium as preheating mud carries out preheating to wet mud in the preheating feeding device, thereby realizes the reuse of used heat.
Mud after the preheating feeding device preheating by connecting preheating feeding device sludge outlet and the pipeline of the mud import of desiccation apparatus enter desiccation apparatus 2 the insides, desiccation apparatus is comprised of the evaporator room that connects successively and kiln, desiccation apparatus inside is provided with agitator and scraper plate, desiccation apparatus also is provided with vacuum gooster pump, vacuum gooster pump makes the inner vacuum tightness that keeps of desiccation apparatus, has strengthened the heat transfer power of recovered steam.Mud enters evaporator room after entering desiccation apparatus, evaporator room is take indirect heat exchange as main, the steam that uses main thermal source to produce as the drying sludge process, mud and steam are isolated mutually and the heat-exchanger rig by between the two carries out heat exchange, make heat energy conduct to mud by steam and make water evaporation in the mud, afterwards through directly contacting with superheated vapour on the drying chamber of mud in kiln of heat exchange and moisture wherein being evaporated, the steam that evaporation forms is sneaked into the superheated vapour after the heat release, and the superheated vapour after water vapour and the heat release is mixed into the part of technological cycle gas.The feed end of evaporator room is provided with the heat-exchanger rig that carries out indirect heat exchange for mud and steam, this process is a small amount of supplemental heat source or need not supplemental heat source according to actual needs, the live steam that supplemental heat source generally produces for steam-pipe, steam-pipe replenishes valve access thermal source pipeline by steam or replenishes valve by steam and directly access in the desiccation apparatus, and the purpose of supplemental heat source is be used to keeping the internal system temperature and guaranteeing steam output.In the drying sludge process, agitator and scraper plate stir the surface of constantly updating mud to mud, and Sludge Surface is fully contacted with heat-exchanger rig, improve vaporization efficiency.Entered the mud import of cooling discharge unit by the sludge outlet of desiccation apparatus through the mud of pervaporation and drying, the mud of comparatively high temps enters the cooling discharge device and carries out heat exchange, the steam condensate that the desiccation apparatus heat transfer process produces is entered in the preheating feeding device by the steam condensate import of desiccation apparatus steam condensate outlet by preheating feeding device, the preheating of wet mud in steam condensate is used for preheating feeding device after the heat-exchanger rig of preheating feeding device carries out heat exchange.The mixed gas that the superheated vapour that produces after the steam of drying process mud evaporation and the heat release and the part of thermal source gas form enters technological cycle gas reclamation set by the recovered steam outlet that is positioned at desiccation apparatus top.Technological cycle gas reclamation set is comprised of the dust removing units 4, filtering unit 5, mechanically compress unit 6 and the allocation units 7 that connect successively, interconnect by pipeline between each integral part, the technological cycle gas that produces is entered in dust removing units 4 and the filtering unit 5 by pipeline by the technological cycle gas outlet of desiccation apparatus, technological cycle gas is carried out dedusting and filtration, make technological cycle gas become after treatment clean gas, avoid causing exploding because containing dust in the gas, the risk of fouling etc., keep system stable operation.The clean gas that obtains carries out the compression of gas in pipeline passes into mechanically compress unit 6, the mechanically compress unit can adopt centrifugal, a kind of in Roots type or the positive displacement vapour compression equipment or dispose as required the device that the plural serial stage of several equipment forms, thereby the pressure and temperature of lifting process circulation gas, technological cycle gas enters allocation units 7 through pipeline by machine assembly 6, technological cycle gas after 7 pairs of compressions of allocation units carries out voltage stabilizing, heat up, distribute, the control device that is positioned at allocation units inside divides the gas ratio that is used in heat exchange and circulation according to monitor signal, distribute the kiln that the gas part of ratio sends desiccation apparatus back to through pipeline and carry out drying and circulation, heat-transfer surface and mud that another part is sent to the heat-exchanger rig place of desiccation apparatus carry out heat exchange.The outlet of two portions technological cycle gas can be passed through a pipeline or connect respectively two different zones of desiccation apparatus inside by different pipelines, this process has substituted a large amount of fresh heat that evaporation consumes so that the steam calorific value that the drying sludge process produces is back to drying process after mechanically compress.In addition, the totally-enclosed operation of whole device, the gas barrier that preheating feeding device inside is provided with makes a small amount of non-condensable gas be used for the gas-tight silo sealing gland, without the foul smell discharging, thereby reduces the foul smell blowdown presssure.
Compare existing all kinds of drying method and system, the advantage of this mummification method and system is:
(1) energy-saving manner of sludge drying is that steam directly recycles, and utilising efficiency is high.
(2) system's resistance to air loss is strong, only has micro-non-condensable gas to discharge, and has reduced the foul smell processing pressure.
(3) systematic entirety is strong, realize the raising of system's efficiency of utilization by integrated configuration, energy-saving effect is outstanding, evaporate 1 kg of water, only need to consume 50-200 kilocalorie heat (theoretical calculation, may not consume) and 0.08-0.2 degree electricity, press energy equivalent conversion energy consumption 0.5-1.6MJ/kg vaporize water, comprehensive energy consumption is compared existing dry technology and is saved 65-82%.
(4) drying plant has comprehensively adopted multiple drying process principle, and drying efficiency is high.
(5) vapor condensation and mud heating are coupled into a process, have saved water vapour cool-down dehumidification process, reduced the circulating cooling water consumption.
(6) system finishes on-line monitoring and control by the PLC automatic control system, and real-time adjust operation parameter, raising system in the 50-100% load range, are kept system energy consumption fluctuation≤10% to mud adaptability.
Claims (10)
1. the method for steam heat circulating sludge mummification is characterized in that may further comprise the steps:
(1) mud is carried out preheating;
(2) adopting steam is thermal source gas, and the mud of step (1) is carried out heat exchange and drying;
(3) to the mud of step (2) cool off, discharge.
2. the method and system of steam heat circulating sludge as claimed in claim 1 mummification, it is characterized in that step (1) is airtight and can discharge under the environment of a small amount of non-condensable gas and carry out, and the steam condensate that adopts described step (2) to produce carries out preheating to mud, the whole of the heat exchange lime set that produces after heat exchange are heat-eliminating medium or a part of heat-eliminating medium as step (3) of step (3), and redundance is discharged as waste water.
3. the method and system of steam heat circulating sludge as claimed in claim 2 mummification is characterized in that described heat exchange lime set is used for step (1) as the heat release medium of preheating mud.
4. the method and system of steam heat circulating sludge as claimed in claim 3 mummification, it is characterized in that the steam described in the step (2) is technological cycle gas and adds or do not add as required supplemental heat source, described supplemental heat source is live steam, the technological cycle gas that step (2) produces distributes after dedusting, filtration and mechanically compress, obtain the technological cycle gas that pressure raises, has relevant pressure and temperature after mechanically compress, described gas is reused for heat exchange and the drying process of step (2).
5. such as claim 1,2, the method and system of 3 or 4 described steam heat circulating sludge mummification, it is characterized in that in the step (2), described heat exchange and drying are carried out under negative pressure and air tight condition in two steps successively, the indirect heat exchange mode is adopted in described heat exchange, described mud and steam are isolated mutually and the heat-transfer surface by between the two carries out heat exchange, heat energy conducts to mud by steam and the water in the mud is evaporated, described drying is for directly contacting with the mud after superheated vapour and the heat exchange and moisture wherein being evaporated, superheated vapour after the steam of the formation of described mud in dry evaporative process is sneaked into heat release consists of the part of described technological cycle gas.
6. steam heat circulating sludge anhydration system, it is characterized in that comprising preheating feeding device, desiccation apparatus, technological cycle gas reclamation set and cooling discharge device, described desiccation apparatus comprises successively directly mud being carried out drying and take away the kiln of the water vapor that mud evaporates take indirect heat exchange as main evaporator room with superheated vapour of connecting, the sludge outlet of described preheating feeding device connects the mud import of described desiccation apparatus, the recovered steam outlet of described desiccation apparatus is connected by the steam inlet of pipeline with described technological cycle gas reclamation set, described desiccation apparatus is provided with the thermal source gas feed, and the thermal source gas feed of described desiccation apparatus connects the vapour outlet of described technological cycle gas reclamation set by the thermal source pipeline.
7. a kind of steam heat circulating sludge anhydration system as claimed in claim 6, it is characterized in that also being provided with and replenish the steam-pipe that steam uses and the vacuum gooster pump that is used in described desiccation apparatus, forming the certain vacuum degree, described steam-pipe replenishes valve access thermal source pipeline by steam or replenishes valve by steam and directly access described desiccation apparatus, be provided with agitator and scraper plate in the described desiccation apparatus, be provided with the heat-exchanger rig that carries out indirect heat exchange for mud and steam in the described evaporator room, be provided with the drying chamber that allows steam and mud directly to contact in the described kiln.
8. such as claim 6 or 7 described a kind of steam heat circulating sludge anhydration systems, it is characterized in that described technological cycle gas reclamation set is by the dust removing units that connects successively, filtering unit, mechanically compress unit and allocation units form, the recovered steam outlet of described desiccation apparatus connects the steam inlet of dust removing units by pipeline, the vapour outlet of described allocation units is by a pipeline or connect respectively kiln and the evaporator room of described desiccation apparatus by different pipelines, described allocation units are provided with for the control device that distributes evaporator room and kiln thermal source gas ratio, and described mechanically compress unit adopts centrifugal, device after one or more devices in series in Roots type or the positive displacement vapour compression equipment.
9. a kind of steam heat circulating sludge anhydration system as claimed in claim 8, the lime set outlet that it is characterized in that described desiccation apparatus is connected with the lime set import of described preheating feeding device by pipeline, the sludge outlet of described desiccation apparatus is connected with the mud import of described cooling discharge device by pipeline, described preheating feeding device is total closed type, is provided with heat-exchanger rig and gas barrier.
10. a kind of steam heat circulating sludge anhydration system as claimed in claim 9 is characterized in that the sludge outlet of described cooling discharge device connects the sludge-drying discharge line, and the sludge inlet of described preheating feeding device is provided with the sewage sludge feed pipeline.
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| CN103708702A (en) * | 2014-01-02 | 2014-04-09 | 同济大学 | Energy-saving sludge drying device by utilizing recovery waste heat of vapor compression |
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| CN104671633A (en) * | 2015-03-16 | 2015-06-03 | 天华化工机械及自动化研究设计院有限公司 | Steam condensate preheating and steam drying two-stage energy-saving sludge drying method |
| CN105084710A (en) * | 2015-09-15 | 2015-11-25 | 南京大学环境规划设计研究院有限公司 | Sludge energy-saving drying unit and sludge energy-saving drying method |
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| CN114956509A (en) * | 2022-07-29 | 2022-08-30 | 生态环境部华南环境科学研究所(生态环境部生态环境应急研究所) | Waste gas extraction system in mud carbomorphism |
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| CN113648728A (en) * | 2021-07-22 | 2021-11-16 | 中城院(北京)环境科技有限公司 | Sludge drying tail gas purification treatment system and method |
| CN113648728B (en) * | 2021-07-22 | 2022-07-15 | 中城院(北京)环境科技有限公司 | Sludge drying tail gas purification treatment system and method |
| CN114956509A (en) * | 2022-07-29 | 2022-08-30 | 生态环境部华南环境科学研究所(生态环境部生态环境应急研究所) | Waste gas extraction system in mud carbomorphism |
| CN117515953A (en) * | 2024-01-08 | 2024-02-06 | 湖南清源华建环境科技有限公司 | Superheated steam drying high-temperature heat pump energy recovery system |
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